Why do planetary bodies rotates around axis. Which force is causing this rotation and why. Also are the stars rotating as well and do planets orbit them because they are rotating or is there some other reason.
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There are many more states for a mass that include rotation than don’t. There is only one non-rotating energy state while there are an infinite number of rotating energy states. It would be strange for something NOT to rotate. Any external not perfectly balanced force would want to cause a rotation and there isn’t anything in space that provides drag like air or water in the atmosphere so all the tiny little pushes add up over the millions of year. For planets in general it is how they come together as they condense from the original stuff that created the solar system. The conservation of momentum means that as they all aggregate into a planet they add up to rotation.
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